
.login
    position: absolute; 
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;

.spin
    position: absolute;
    top: 200px;
    left 50%;
    transform: translateX(-50%);
    z-index 2;
.login-box
    position: absolute;
    top: 40%;
    left 50%;
    transform: translate(-50%,-50%);
    z-index 1;
    width: 400px;
    h3
        text-align: center;
    .login-form
        margin-top:30px;